From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1VvNSN-0004Ef-W2 for bitcoin-development@lists.sourceforge.net; Tue, 24 Dec 2013 08:35:16 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of bluematt.me designates 192.241.179.72 as permitted sender) client-ip=192.241.179.72; envelope-from=bitcoin-list@bluematt.me; helo=mail.bluematt.me; Received: from mail.bluematt.me ([192.241.179.72]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1VvNS8-0007ct-6g for bitcoin-development@lists.sourceforge.net; Tue, 24 Dec 2013 08:35:15 +0000 Received: from [10.232.233.6] (vps.bluematt.me [173.246.101.161]) by mail.bluematt.me (Postfix) with ESMTPSA id 8B7AF48CA5 for ; Tue, 24 Dec 2013 08:34:54 +0000 (UTC) Message-ID: <52B9472D.9000303@bluematt.me> Date: Tue, 24 Dec 2013 00:34:53 -0800 From: Matt Corallo User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: bitcoin-development@lists.sourceforge.net References: <52B7AC86.9010808@monetize.io> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.0 (--) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.0 URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [URIs: doubleclick.net] -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_PASS SPF: sender matches SPF record -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 TIME_LIMIT_EXCEEDED Exceeded time limit / deadline X-Headers-End: 1VvNS8-0007ct-6g Subject: Re: [Bitcoin-development] Bitcoin difficulty sanity check suggestion X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Dec 2013 08:35:16 -0000 An attacker with some small hashpower isolates you (as an individual) from the network by MITMing your network. You just switch the the attackers chain as if nothing happened because of the network rule that defines it as OK. Today, you will see that you're behind and warn the user. Was it really so hard to write a three-sentence paragraph to clarify the attack instead of insulting people? Still, posting ideas here without spending time to ensure you understand the Bitcoin network well is frowned upon. Matt On 12/23/13 17:51, Ryan Carboni wrote: > I think you misunderstood my statement. If time > 3 days, and after > 4 blocks have been mined, then difficulty would be reset. > > In theory, one would have to isolate roughly one percent of the > Bitcoin network's hashing power to do so. Which would indicate an > attack by a state actor as opposed to anything else. Arguably, the > safest way to run Bitcoin is through a proprietary dial-up > network. > > > On Sun, Dec 22, 2013 at 7:22 PM, Mark Friedenbach > > wrote: > > Ryan, these sort of adjustments introduce security risks. If you > were isolated from the main chain by a low-hashpower attacker, how > would you know? They'd need just three days without you noticing > that network block generation has stalled - maybe they wait for a > long weekend - then after that the block rate is normal but > completely controlled by the attacker (and isolated from mainnet). > > There are fast acting alternative difficulty adjustment algorithms > being explored by some alts, such as the 9-block interval, > 144-block window, Parks-McClellan FIR filter used by Freicoin to > recover from just such a mining bubble. If it were to happen to > bitcoin, there would be sophisticated alternative to turn to, and > enough time to make the change. > > On 12/22/2013 07:10 PM, Ryan Carboni wrote: >> I think Bitcoin should have a sanity check: after three days if >> only four blocks have been mined, difficulty should be adjusted >> downwards. > >> This might become important in the near future. I project a >> Bitcoin mining bubble. > > > > > > ------------------------------------------------------------------------------ > > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application > performance affects their revenue. With AppDynamics, you get 100% > visibility into your Java,.NET, & PHP application. Start your > 15-day FREE TRIAL of AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > > > > > _______________________________________________ Bitcoin-development > mailing list Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development >